Mead Press-it-Seal Security Envelopes provide a reliable way to mail important documents while keeping them private. These No. 10 envelopes measure 4 1/8" x 9 1/2" and feature a special lining that protects your information from being seen. The convenient self-adhesive closure makes sealing the envelopes quick and simple. Just peel the strip off, and the envelope seals instantly with no need to lick or moisten. Each box holds 45 envelopes, making it easy to stay prepared for any mailing needs. Trust these security envelopes to ensure your sensitive materials reach their destination safely and securely.